Pear rust: how to spot, prevent and treat it disease
How do you spot pear rust?
In summer and early autumn bright orange blotches appear on the upper side of the pear leaves, and later, on the underside opposite them, brown outgrowths like galls. On the juniper there are lasting swellings on branches and stems, from which orange jelly-like horns push out in spring after damp days.
How do you prevent pear rust?
The fungus needs both plants and cannot close its cycle without one of them: from the pear it goes to the juniper, from the juniper in spring back to the pear. A juniper near a pear is therefore not an innocent neighbour. The spores travel a good way on the wind, so removing one bush is no guarantee.
What works against pear rust?
Cut the infected parts of the branches out of the juniper or take the bush away from the neighbourhood of the pear. On the pear cut out any cankered wounds on the branches. Stripping the leaves off a badly infected pear does more harm than good.
Which plants get pear rust? 2
Fruit trees 1
Ornamentals 1
Sources: EPPO Global Database, Royal Horticultural Society
Checked on 18 August 2026.